I believe it is just feed. We have the feed hanging off the ground but maybe not high enough...or we need to change the process a bit and not have food ready for the morn. But I do want to make sure it isn't anything more dangerous - like the predator animals. We've got a big run, and put the wire out a bit, and cinder blocks, and this is on top of having separate coops within the large run - so they have a bit of their own security of course, but they're coops. Since something is getting past the large run, I have another barrier but I don't really want them breaching the first to begin with. If its rats, then I can lift up the food a bit more and that will hopefully deter them from wanting to be there. If it's something other than rats, then I'll need more harsh measures.
I have a mink trap and we've put it in at night with some peanut butter to see if anything tries to eat that...but no takers yet. Just wanted a camera so I can see what we're dealing with.